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Analog Devices Inc. LTC3122HMSE#PBF
- Part No.:
- LTC3122HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3122HMSE#PBF.pdf
- Description:
- IC REG BOOST ADJ 2.5A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:136
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Product details
Overview
LTC3122HMSE#PBF from Analog Devices (formerly Linear Technology) is a synchronous step-up DC/DC converter with true output disconnect, 2.5A current limit, and programmable output voltage up to 15V. It operates from input voltages as low as 1.8V at startup and down to 500mV after regulation, enabling extended runtime in battery-powered systems such as piezo actuators and RF power modules.
For engineers reviewing the LTC3122HMSE#PBF datasheet, LTC3122HMSE#PBF pinout, LTC3122HMSE#PBF application, or LTC3122HMSE#PBF equivalent, key selection criteria include its 12-lead MSOP package with exposed thermal pad, adjustable 100kHz–3MHz switching frequency, Burst Mode® operation delivering 25µA quiescent current, and robust protection including overvoltage, thermal shutdown, and short-circuit current limiting.
Technical Context
The LTC3122HMSE#PBF implements current-mode PWM control with adaptive slope compensation for stable regulation across wide VIN/VOUT ratios and fast transient response. Its dual-MOSFET synchronous rectification-N-channel switch (0.121Ω RDS(ON)) and P-channel rectifier (0.188Ω RDS(ON))-enables up to 95% efficiency while supporting discontinuous conduction mode via zero-current detection.
It integrates a 10ms closed-loop soft-start, VCC LDO regulator (4.25V nominal), and anti-ringing circuitry activated when VOUT ≥ VIN + 2V. The device supports external clock synchronization (0.1–3MHz), selectable Burst Mode® or fixed-frequency PWM operation, and output disconnect during shutdown to eliminate reverse current and enable full VOUT discharge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V at startup; sustains regulation down to 500mV after VOUT ≥ 2.2V - enables deep battery discharge utilization. |
| Output Voltage Range | 2.2V to 15V, set by external resistor divider on FB pin - supports 12V analog rails from single-cell Li-ion or backup capacitors. |
| Switching Frequency | Adjustable 100kHz–3MHz via RT pin resistor - allows trade-off between efficiency (low f) and solution size (high f). |
| Peak Switch Current Limit | 2.5A typical (3.5A max), independent of VIN/VOUT except below 1.5V - ensures consistent overload protection across operating range. |
| Quiescent Current | 25µA in Burst Mode®, <1µA in shutdown - minimizes standby power in always-on sensor or IoT nodes. |
| Efficiency | Up to 95% with synchronous rectification - reduces thermal load in space-constrained 12-lead MSOP package. |
| Thermal Rating | Junction temperature range –40°C to +150°C - qualified for high-reliability industrial and automotive under-hood applications. |
Pinout & Package
Package: 12-lead thermally enhanced MSOP (3mm × 4mm × 1.1mm) with exposed PGND pad requiring soldering to PCB ground plane for θJA = 40°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1) | Power switch node | Connects to inductor; internal anti-ringing resistor engages when VOUT ≥ VIN + 2V to suppress EMI in DCM. |
| PGND (2,13) | Power ground return | Low-impedance path for inductor current and output capacitor; exposed pad must be soldered to PCB ground for thermal integrity. |
| VIN (3) | Main input supply | Primary power source; supports operation down to 500mV post-startup; bypass with ≥4.7µF ceramic capacitor. |
| PWM/SYNC (4) | Mode control & clock sync | High = PWM mode; Low = Burst Mode®; external clock input (0.1–3MHz) disables Burst Mode and synchronizes oscillator. |
| VCC (5) | Internal LDO output | Regulated ~4.25V rail powering gate drivers and control logic; derived from VIN or VOUT depending on conditions. |
| RT (6) | Oscillator frequency set | Resistor to SGND programs fOSC = 57.6/RT (MHz); RT = 57.6kΩ yields 1MHz nominal switching. |
| VC (7) | Error amplifier output | Loop compensation node; RC network connected here stabilizes feedback control for varying loads and layouts. |
| FB (8) | Feedback input | Senses resistive divider output; regulates VOUT = 1.202V × (1 + R1/R2); 1.202V reference tolerance ±2.1%. |
| SD (9) | Shutdown control | Logic-level input: >1.6V = active; <0.25V = shutdown with <1µA IQ; tolerates voltage above VIN/VOUT within abs max limits. |
| SGND (10) | Signal ground reference | Reference for FB, VC, and CAP; separate from PGND to avoid noise coupling into error amplifier. |
| VOUT (11) | Regulated output & rectifier source | Drives synchronous P-channel MOSFET; disconnected from VIN during SD low to prevent backfeed and enable full discharge. |
| CAP (12) | Synchronous rectifier bias reference | Capacitor to VOUT creates ~5.6V below VOUT rail to drive P-channel gate; requires 100nF low-ESR ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| True output disconnect | Eliminates body diode conduction during shutdown, enabling full VOUT discharge and zero input current draw. |
| Programmable Burst Mode® | Reduces IQ to 25µA at light loads while maintaining regulation; output ripple held to 1–2% p-p via adaptive burst timing. |
| Inrush current limiting | 10ms closed-loop soft-start prevents input surge; independent of output capacitance value or programmed VOUT. |
| Robust fault protection | Integrated OVP (16.2V trip), thermal shutdown (170°C), short-circuit current foldback (1.6A limit), and UVLO on VCC. |
| Wide-input, high-efficiency boost | Starts from 1.8V, sustains from 500mV; achieves >90% efficiency at 800mA/12V from 5V input using synchronous topology. |
Applications
| Piezo Actuator Driver | RF Power Amplifier Supply |
|---|---|
Use Scenario: Driving high-voltage piezoelectric transducers in ultrasonic cleaning or precision positioning systems requiring 10–15V from low-voltage batteries. IC Role / Device Role / Timing Role: Synchronous boost converter providing regulated, low-noise high-voltage rail with output disconnect to prevent transducer depolarization during idle. Use Value: Enables >12V output from single-cell Li-ion (2.7–4.2V) with 2.5A peak current support and minimal board area due to 3MHz capability. |
Use Scenario: Generating stable 12V supply for GaN or LDMOS RF power amplifiers in portable test equipment or wireless infrastructure. IC Role / Device Role / Timing Role: High-efficiency step-up regulator delivering clean, low-ripple 12V rail with external clock synchronization to avoid interference with sensitive RF bands. Use Value: Achieves 95% efficiency at 800mA load and supports SYNC pin locking to system clock, reducing spectral noise near critical frequencies. |
| Small DC Motor Drive | 12V Analog Rail Generator |
Use Scenario: Powering miniature brushed DC motors (e.g., in medical pumps or robotics) requiring 5–12V from 3.3V or 5V system rails. IC Role / Device Role / Timing Role: Adjustable-output boost converter with inrush limiting and output disconnect to prevent motor coasting or unintended motion during power-down. Use Value: Delivers 800mA at 12V from 5V input with programmable soft-start and <1µA shutdown current for energy-conscious actuation control. |
Use Scenario: Creating isolated 12V analog supply for op-amps, ADCs, or DACs in battery-powered instrumentation where noise and headroom are critical. IC Role / Device Role / Timing Role: Low-noise, high-PSRR boost converter with Burst Mode® for ultra-low IQ during sleep cycles and PWM mode for low-ripple active operation. Use Value: Provides 12V rail with <25µA no-load IQ and <1% output ripple in PWM mode, minimizing analog signal corruption in precision measurement paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Higher 5.5A current limit; fixed 500kHz/1MHz/2.2MHz options; no output disconnect; 2.7–12V input only. | Lacks true output disconnect and sub-1V operation; better suited for higher-current, non-battery-depletion applications. | Select TPS61088RHLR when peak current >3A is required and output discharge is not needed; verify layout compatibility with 20-pin QFN. |
| MAX17222ETA+ | Lower 1.2A current limit; 0.5–5.5V input; integrated 1.2V LDO; no external RT or SYNC; 1.5µA IQ in shutdown. | Optimized for ultra-low-power coin-cell applications; lacks programmable VOUT and high-voltage capability. | Choose MAX17222ETA+ for sub-100mA, <5V output designs where minimal IQ and small footprint outweigh flexibility needs. |
Compared with TPS61088RHLR and MAX17222ETA+, the LTC3122HMSE#PBF uniquely combines deep-input operation (500mV), true output disconnect, and 15V programmable output in a thermally robust MSOP package-making it optimal for high-reliability, wide-VIN industrial and medical boost applications where controlled power sequencing and battery longevity are critical.
Availability
LTC3122HMSE#PBF is available at Aetrix Electronics and suitable for RF power supplies, piezo actuator drivers, small DC motor controllers, and 12V analog rail generation requiring stable component supply across extended temperature ranges.
Supply support for LTC3122HMSE#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio with rigorous qualification standards.
The LTC3122 product line delivers high-efficiency, wide-input synchronous boost converters with advanced protection and thermal resilience for demanding industrial, medical, and portable power applications.
FAQ
What is the minimum input voltage required to start up the LTC3122HMSE#PBF?
The LTC3122HMSE#PBF requires a minimum input voltage of 1.7V (typical) to initiate startup, with guaranteed operation from 1.8V across temperature. Once regulation is established and VOUT reaches ≥2.2V, the device continues operating with input voltages as low as 500mV - a key feature for maximizing energy extraction from depleted batteries. This behavior is confirmed in the Electrical Characteristics table under "Minimum Start-Up Voltage" and "Input Voltage Range After VOUT ≥ 2.2V".
Does the LTC3122HMSE#PBF support output disconnect, and how does it function?
Yes, the LTC3122HMSE#PBF provides true output disconnect during shutdown: when the SD pin is pulled below 0.25V, the internal P-channel synchronous rectifier is fully disabled, eliminating body-diode conduction and allowing VOUT to discharge completely to 0V. This prevents reverse current flow into the input source and enables precise power sequencing. The feature is explicitly documented in the "Features" section and "Output Disconnect" subsection of the Applications Information.
What is the purpose of the CAP pin on the LTC3122HMSE#PBF, and what capacitor value is recommended?
The CAP pin on the LTC3122HMSE#PBF serves as the low-side reference for driving the gate of the internal P-channel synchronous rectifier, generating a bias rail approximately 5.6V below VOUT. A low-ESR ceramic capacitor (typically 100nF) must be placed directly between CAP and VOUT to ensure stable gate drive and efficient synchronous rectification. This requirement is specified in the "Pin Functions" section and validated in the Typical Application schematic.
How does Burst Mode® operation affect efficiency and output ripple on the LTC3122HMSE#PBF?
Burst Mode® operation on the LTC3122HMSE#PBF reduces quiescent current to 25µA at light loads, significantly improving light-load efficiency versus PWM mode. However, it introduces higher output voltage ripple (typically 1–2% peak-to-peak) due to intermittent energy delivery. Adding ≥10µF output capacitance or a 10–50pF feed-forward capacitor from VOUT to FB can reduce ripple. These trade-offs and mitigation methods are detailed in the "Burst Mode Operation" subsection of Applications Information.
What thermal derating applies to the LTC3122HMSE#PBF in its MSOP package?
The LTC3122HMSE#PBF in the 12-lead MSOP package has a maximum junction temperature of 150°C and thermal impedance θJA = 40°C/W (with proper PCB copper pour and exposed pad soldering). Derating begins at ambient temperatures above 110°C assuming full load; continuous operation above 150°C junction triggers thermal shutdown at ~170°C. These values are specified in the Absolute Maximum Ratings and Pin Configuration tables, with thermal pad soldering explicitly required for rated performance.
LTC3122HMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.2V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 2.5A (Switch)
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3122HMSE#PBF FAQ
1.How can I place an order for LTC3122HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3122HMSE#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC3122HMSE#PBF reliable?
The price and inventory of LTC3122HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3122HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3122HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3122HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3122HMSE#PBF?
LTC3122HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3122HMSE#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC3122HMSE#PBF?
For technical support, including LTC3122HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3122HMSE#PBF requirements.
6.How does Aetrix verify that LTC3122HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3122HMSE#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC3122HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3122HMSE#PBF?
All LTC3122HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3122HMSE#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC3122HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3122HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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